— Plumbing & heating · South London

Plumbing and heating across South London.

Boilers, underfloor heating, full bathroom installations, kitchen plumbing, drainage and pipework — all gas work carried out by individually qualified Gas Safe registered subcontractors.

Two decades of plumbing and heating across South London — boiler installations and replacements, full bathroom and kitchen installations, underfloor heating, pipework re-routing, drainage. LMDEC project-manages every plumbing and heating job; gas work is carried out by our trusted independent subcontractors who are individually Gas Safe registered. Most of our plumbing work is part of a wider refurbishment, but we also take on standalone plumbing jobs in family homes across South London.

— What we do

Plumber South London — services we deliver.

Boiler installations and replacements

Combi, system and conventional boilers — Worcester Bosch, Vaillant, Ideal, Baxi. We assess your hot water needs, radiator demand and current system, then recommend the right output and brand. Power-flushed system, magnetic filter fitted, MagnaClean or equivalent, 10-year manufacturer warranty registered. All boiler installations carried out by individually qualified Gas Safe registered subcontractors with proper Gas Safe certificate issued on completion.

Underfloor heating

Wet (water-based) underfloor heating in kitchens, bathrooms, extensions and full ground-floor refurbishments. Manifold and zone controls, screed laid level, pressure tested before flooring goes down. Electric underfloor heating for smaller bathroom and ensuite installations. Compatible with engineered oak, herringbone, LVT and tiled finishes.

Bathroom and ensuite plumbing

Full bathroom and ensuite plumbing installations — soil stack re-routing, hot and cold pipework, waste runs, shower and bath installation, sanitaryware fitting, tap and shower commissioning. Frequently combined with our wider bathroom renovation service.

Kitchen plumbing

Sink and tap installations, dishwasher and washing machine plumbing, instant-hot-water taps (Quooker, Insinkerator), waste-disposal units, water filters. Re-routing pipework when kitchens are being moved or extended. Frequently part of our wider kitchen renovation service.

Drainage and waste

Blocked drains, soil stack issues, waste pipe re-routing, basement pump-out drainage, garden drainage. Particularly common in Victorian South London terraces where the original cast iron stacks have failed or the layout no longer suits how the property is being used.

Pipework and general plumbing

Pipe re-routing during refurbishments, leak repairs, tap replacements, radiator changes, towel rail installations, garden tap installations. Old lead pipework replaced with copper or PEX where found — common in Victorian properties across Clapham, Balham, Dulwich and Wandsworth.

— What it costs

Plumber South London — plumbing and heating costs 2026.

Honest ranges based on the plumbing and heating work we actually do across South London in 2025-2026. Final price depends on accessibility, brand and specification, existing pipework condition, and the amount of make-good (plastering, decoration) required afterwards.

Boiler installation · £2,000 – £4,000

Combi or system boiler replacement with new flue, magnetic filter, system flush, thermostat, and 10-year manufacturer warranty registered. Like-for-like swap at the lower end; relocating the boiler, upgrading from system to combi, or moving to a different brand at the higher end. Carried out by individually qualified Gas Safe registered subcontractors with Gas Safe certificate issued on completion.

Boiler service · £80 – £150

Annual boiler service — visual inspection, combustion analysis, flue gas check, safety controls tested, filter cleaned. Mandatory for landlords (Gas Safety Certificate / CP12) and sensible for owner-occupiers to keep the manufacturer’s warranty valid. Carried out by Gas Safe registered subcontractor.

Bathroom plumbing · £2,000 – £5,000

Plumbing element only — first-fix pipework, second-fix installation of sanitaryware, taps, shower, bath. Excludes sanitaryware itself, tiling, and decoration. For a full bathroom renovation, see our bathroom renovation page (£6k–£35k+ for the complete project).

Drainage and blockages · £150 – £400

Standard drain clearance using mechanical rods or high-pressure jet. Major issues (collapsed pipes, root ingress, soil stack failure) are quoted separately after the CCTV survey.

All prices include labour, basic materials, certification and make-good. Sanitaryware, boilers and major fixtures are supplied separately or through our trade accounts. VAT extra.

— How we work

Our plumbing and heating process.

Plumbing is the trade that causes the most stress when it fails — leaks, no hot water, blocked drains. LMDEC project-manages every plumbing and heating job end-to-end. Gas work is carried out by our trusted independent subcontractors who are individually Gas Safe registered — proper certification issued on completion, registration numbers provided on request for verification before work starts. No cutting corners, no informal gas work.

1. Site visit and assessment

We assess existing pipework (copper, plastic, lead), check water pressure, inspect boiler condition, identify any obvious leaks or hidden damp, discuss your heating and hot water needs.

2. Fixed-price quote

Itemised — labour, materials, boiler or major fixtures, certification, plaster repair and decoration touch-up. If we find old lead pipework or a failed waste run behind tiles, we tell you before we proceed.

3. Install and commission

Pipework run, fixtures installed, system filled, pressure tested, and commissioned. Gas Safe certificate issued for boilers and gas appliances by the individually qualified Gas Safe registered subcontractor on completion. Make-good completed by LMDEC team — plaster repair, decoration touch-up.

4. Handover and warranty

Walkthrough, manuals and warranty documents handed over. Two-year LMDEC workmanship warranty on installation work. Manufacturer warranties on boilers (typically 10 years) registered for you. We come back at six months to check the installation — included.

— Why LMDEC

Why South London homeowners trust LMDEC for plumber South London services.

Individually qualified Gas Safe registered subcontractors on every gas job. Boilers, gas appliances, gas pipework — all installations carried out by our trusted independent subcontractors who hold individual Gas Safe registration. Proper certification issued on completion. Registration numbers provided on request so you can verify each tradesperson directly on the official Gas Safe Register before work starts.

Period property experience. Victorian and Edwardian South London properties have particular plumbing quirks — lead pipework, cast iron soil stacks, low water pressure in upper floors, basement properties needing pump-out drainage. Two decades of working with these.

One team, full project. Plumbing rarely happens in isolation — it sits within kitchen, bathroom, and full-house refurbishments. LMDEC coordinates our team of carpenters, plasterers, tilers and decorators alongside Gas Safe registered plumbing subcontractors and NICEIC certified electrical subcontractors. No phone-tag between trades.

£2 million Public Liability insurance, two-year LMDEC workmanship warranty, manufacturer warranties registered on your behalf. We return at six months to check the install — included.

— Common questions

Plumber South London — frequently asked.